It is 618.4, exactly as in the question.
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To round 618.4 to the nearest tenth, we look at the digit in the hundredths place, which is 4. Since 4 is less than 5, we do not need to round up. Therefore, 618.4 rounded to the nearest tenth is 618.4.
Well, darling, 618.4 rounded to the nearest tenth is 618.4. Why? Because that little bugger is already sitting pretty on the tenth spot, so there's no need to shake things up. Just let it be and move on to the next math conundrum.
Well, isn't that a happy little number we have here! If we want to round 618.4 to the nearest tenth, we simply look at the digit in the hundredths place, which is 4. Since 4 is less than 5, we keep the tenths place as it is, making it 618.4 rounded to the nearest tenth.
It is then 56.5 when rounded to the nearest tenth
It is 0.8 when rounded to the nearest tenth
10775.9
4.9
305.7